Power transmission for traction-elevators.



A. SUNDH.

POWER TRANSMISSION FOR TRACTION ELEVATORS.

Patented May 11, 1909.

APPLICATION FILED JULY 6.1907.

INVENTOR UNITED STATES PATENT OFFICE.

AUGUST SUNDH, OF YONKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

POWER TRANSMISSION FOR TRACTlION-ELEVATORS.

Specification of Letters Patent.

Patented May 11, 1909.

Application filed July 6, 1907. Serial No. 882,466.

To all whom it may concern:

Be it known that I, AUGUST SUNDH, a citizen of the United States, residing at Yonkers, in the county of Westchester and State of ew York, have invented a new and useful Improvement in Power Transmission for Traction-Elevators, of which the following is a specification.

My invention relates to improvements- 1 in traction drive elevator apparatus and has for its object to provide a safe and positive driving rigging free from slipping.

Other objects will appear more fully hereinafter and the novel combinations of elements and arrangements of arts will be specifically pointed out in t e appended claims hereunto annexed.

The accompanying sheet of drawing illustrates a preferred construction of .my elevator apparatus in which Figure 1 shows a front elevation. Fig. 2 is a side elevation of the mechanism shown in Fig. 1. Fig. 3 is a detail view of an adjustable cable and chain connecting device.

Similar reference characters denote similar parts throughout the figures.

Referring to 1 and Fig. 2, M designates a hoisting motor which may be a steam, hydraulic, electric, ,or other prime mover, and is in the present instance shown as an electric motor. 6 designates a loose annular' driving sheave having internal friction surfaces 9, between which is an internal spur gear 12. This loose driving sheave 6 is held in close frictional contact with a drivin member 10 secured to the motor shaft 7 by a key 8 and comprises two friction rollers 10 between which is a spur gear 11. These three elements are preferably securely riveted together. The friction rollers do the actual driving. The spur gears merely prevent slipping. 14 and 14 are grooved rollers loosely mounted on shafts 16 and 16' carried in bearings 15 and 15' respectively, and

lsecurely fastened to the motor bed 17.

The outer periphery of the loose annular driving sheave 6 has one portion grooved to receive the hoist cables 1, 1. The other portion of this surface is formed similar to a sprocket wheel and adapted to receive a chaln 21. the elevator car 0 and pass up and around a direction sheave 4 and lead down and make a half turn around the driving sheave 6, after which they lead up and over a'direc- The cables 1, 1 are connected-to an intermediate hoisting tion sheave 3 and are finally connected to a counterweight 23. Other cables 1, 1' are connected to the counterweight 23 and pass up over the sheave 3 and are connected to a chain 21 by a connector 5. This chain leads down and around the hoisting sheave 6 and is connected by a connector 19 to cables which lead up over the sheave 4 and are attached to the car C. (These latter cables lie directly behind the cables 1, 1 in Fig. 1 and are therefore not visible on the drawing.)

Fig.3 shows a connecting device used to connect the chain 21 to the cables at either end and comprises a rectangular frame 22 at the top of which the cables 1, 1 are connected by having their stands spread apart so as to conform in shape to a conical recess in the frame, and then impregnating the spread out cable strands with molten Babbitt metal in a well known way. The lower end of the frame 22 is drilled to receive a threaded eye-bolt 13 which is connected to the chain 21 at one end and has two nuts, one an adjusting nut 18, the other a lock nut 18 by means of which the chain may be lengthened or shortened with res ect to the frame 22 and cables 1 1. The chain 21 is of such length and so laced with respect to the moving parts of the hoisting apparatus that no matter What position the car may be in, it always embraces the sprocket wheel. surface provided on the peripher of the driving sheave 6 and at no time oes it ever ride up, over the sheaves 3 and 4 at the top of the hatchway.

From the arrangement of parts as shown it is evident that the combined weight 'of the car and counterweight exerts an upward pull upon the loose drlvim sheave 6 substantially equal to this combined weight, and the driving .sheave 6 is therefore pulled with great pressure against the friction driving rollers 10 carried .upon the inotor shaft and this frictional engagement of these driving and driven members supplies the necessary 100 traction for the motor to transmit its rotary motion to the annularv driving sheave 6 and thus to the elevator car O through the cables and chain connected therewith.

The combination of a chain and cables as means when applied to a traction or friction drive elevator ap aratus I believe to be broadly new and t 's arrangement isproductive of many desirable features tending to make such a system 110 50 with the driving apparatus only when the the elevator car.

highly. efficient and with a large factor of safety. In actual practice it would be desirable to have the chain 21 somewhat looser than the cables 1, 1. In this way the cables 1, 1 under ordinaryconditions do the actual driving while the chain will effectually prevent any slipping of the cables. Since the chain 21 is somewhat looser than the cables, any vibration which might result from the use of the chain alone is not transmitted to In many cases the hoistin apparatus is overtaxed and an abnorma strain is placed upon the driving cables which will become stretched and a portion of the load will come upon the chain and the latter therefore acts as a safety device, for even though the hoisting cables should break, the chain is of am le strength to carry the entire load. Furt ermore since the chain is not ordinarily the driving element it will wear butvery little as compared to the cables and for all practical purposes it will last indefinitely, it only being necessary to renew the driving cables.

I, do not claim the specific combination of motor driving elements and a loose annular sheave in this application since, that forms the subject matter of my copending application Serial No. 382,465, filed July 6, 1907, combinedfriction andspur gearing for traction elevators, but

What I do claim as new in the art and desire to otect by Letters Patent of the United tates,-without limiting myself to the precise construction disclosed 1s:-.

1. In an elevator, the combination with a car, of a drive element, flexible means connecting such car and drive element and in frictional engagement with the'latter, and a normally inact1ve flexible means carried with the first-mentioned means and brought into reinforcing action by abnormal stress upon the first-mentioned means.

2. In an elevator, the combination with a car, of driving ap aratus for the car, and a plurality of flexi le members connectin such-car and driving apparatus, one of sai members being normally in frictional engagement with the driving ap aratus, an

other member being in wor 'ng engagement said apparatus, and the other elementbeing in positive driving connection therewith.

4. In an elevator, the combination with driving a paratus, of a device to be actuated, and para el flexible driving connections between the driving apparatus and said device,

said connections having frictional and positive driving engagement respectively with the said driving apparatus.

5. In an elevator, the combination with a motor,'of a driving sheave connected thereto,

a load carrying device and a flexible connection between the driving sheave and the loadcarrying device, said flexible connection being in frictional engagement with said driving sheave, and an'additional flexible connection between the driving sheave and said load-carrying device, said additional connec tion being in positive driving engagement with said sheave.

6. In an elevator, the combination with a driving sheave, of a car, and a chain and a cable in engagement with the driving sheave and connected to the car.

7. In an elevator, the combination with a driving sheave, of a car, a cable continuously in frictional en agement with the sheave and connected to t e car, and a normally slack chain in positive driving engagement with the sheave and also connected to the car.

8. In an elevator, the combination with a motor and a driving sheave connected thereto, of a car and a counterweight, a cable or cables connecting the car and counterweight and in frictional engagement with said driving sheave, and a chain positively associated with said sheave and running with said cable or cables.

9. In an elevator, the combination with a motor and a sheave connected thereto, of a car, and a lurality of flexible members 'between the s cave and the car, said members bein so connected that. one or some of said mem ersshall be in frictional driving contact with the sheave and normally sustain all the load and having sufficient elasticity to permit elon ation under excessive load to glace part 0 the strain on one of the other exible members.

10. In an elevaton'ihecombination with a a driving sheave, of operating means therefor, a car, a cable in frictional engagement with the sheave and connected to the car to normally sustain the load, and a chain in positive engagement with the sheave andcpnnected to the car with a slight amountnof 'slackin the chain under normal load, said cable being sufficiently elastic to permit elongation under excessive load to throw the excess ofstrain' on the chain.

11. In an elevator, the combination with a motor, of an annular driving sheave having driving connections with the motor, a car,.

and flexible drivin means between the car and the sheave, the ast-named means having both frictional and positive driving connections with the sheave.

12. In an elevator, the combination with a driving sheave, of a car and a counterweight,- and parallel flexible members connecting the car and counterweight and associated with said sheave, one 0 said members having frictional driving conneotionwith said shiiave and the other having positive driving connection therewith.

13. In an elevator, the combination with a motor and a driving sheave connected there'- to, of a carand a counterweightmne or more cables connecting the car and counterweight and bein in frictional engagement with said driving s eave, and a chain also connected between the car and counterweight and being in positive engagement with the driving sheave by a sprocket connection therewith.

14. In an elevator, the combination with a motor and a drivin sheave connected thereto, of a car, a flexib e connection between the car and sheave and in frictional en agement with the latter, and an additiona flexible connection between the sheave and the car, said additional member bein normally slack, and means for adjusting sucii slackness.

15, In an elevator, the combination with a motor and a driving sheave connected thereto, of a car, a-cable in frictional enga ement with the driving sheave and connecte to the car, a normally slack chain in positive connection with said sheave and connected to run with said cable, and means for adjusting the length or slackness of such chain.

7 16. In an elevator, the combination with a motor and a driving sheave connected thereto, of a car-and a counterweight, one or more cables connecting 'the car and the counterweight and frictionally associated with said sheave, a normally slack chain positively associated with said sheave and connected to the car and the counterweight, and a device for adjusting the length of said chain to cause the load to be norma ly sustained by said cables, the load bein sustained by the chain in part or entirely on y when an excessive load stretches the cables unduly or causes them to break. I

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

AUGUST SUNDH.

Witnesses:

CHAS. M. NIssEN, JAMES G. BETHELL. 

